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    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
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    <title>JavaScipt异步编程</title>
    <script src="../js/js08_aysnc_timer.js" async></script>
    <link rel="stylesheet" href="../css/common.css">
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<body>
    <h1>异步：事件、定时器</h1>
    <p>定时器:setTimeout / setInterval</p>
    <p class="msg"></p>
    <p>
        <button>异步执行函数</button>
        <textarea name="" id="" cols="30" rows="10">
            点击“异步执行函数”后UI界面可以响应，不产生阻塞。
        </textarea>
    </p>
    <p class="timer"></p>    
    <script>
        document.addEventListener("DOMContentLoaded", function(){
            let msg = document.querySelector(".msg");
            const btn = document.querySelector("button");
                btn.addEventListener("click", function(){
                    setTimeout(function (){
                        done(msg, 100000000, 0);
                    },0)
                   
                    let pElem = document.createElement("p");
                    pElem.textContent = "新增段落";
                    document.body.appendChild(pElem);

                    let dispTimer = document.querySelector(".timer");
                    setInterval(function(){
                        dispTimer.textContent = new Date().toLocaleTimeString();
                    },1000);

                    setInterval((msg) => {
                        console.log(msg);
                    },1000,"更多参数");
                });
        });
    </script>
</body>
</html>